The U.S. Army's logistics doctrine was tuned for wars where supply lines were never shot at. Under the new National Defense Strategy, that assumption no longer holds.
In 1991, the U.S. Army left behind "iron mountains" of supplies in the Saudi desert, the physical symbol of everything its logistics doctrine assumed about warfare: that supply lines would not be shot at. A generation later, the Army's own analysts at West Point's Modern War Institute say that model would shatter under a peer fight. The institution has begun to act. Whether those first moves add up to a survivable backbone, or stop at the slide deck, is the open question.
The argument at the Modern War Institute is that the Army's logistics system was optimized for permissive environments, with uncontested lines, contractor support, and static forward bases, for roughly the past twenty years. Under the National Defense Strategy's pivot toward strategic competition with near-peer adversaries, that assumption is no longer safe. In large-scale combat operations against a near-equal opponent, the logistical tail is the primary target. Cut the tail, and the teeth cannot fight.
The pattern predates the Army. When the Wehrmacht drove toward Moscow in the winter of 1941, it ran out of fuel, winter coats, and time, undone as much by distance and weather as by the Red Army. The Modern War Institute reaches for that precedent as a working analogue of what sustained-fight attrition looks like. Armies built for short, mechanized campaigns against nearby enemies tend to break when the lines stretch, the weather turns, and the opponent fights back. The U.S. Army won the wars of the last two decades in part because logistics was a solved problem. The next war will be defined by logistics being the problem.
Army Futures Command's Contested Logistics Cross-Functional Team is the standing effort to redesign how the service moves fuel, ammunition, spare parts, and medical supplies when forward bases are not safe, when contractor convoys are not protected, and when air superiority is not guaranteed. The doctrinal layer is the slowest in military change, and the one any reform effort has to clear first.
Sustainment under fire has become a standing line in the defense authorization debate. The FY2026 National Defense Authorization Act carried provisions aimed at contested-logistics gaps, and the House Armed Services Committee's report on the FY2027 NDAA extends that work. Whether those provisions translate into fielded capability is the harder question, one the executive summaries do not answer.
The Army, working with the Defense Innovation Unit, has solicited small autonomous boats to perform Pacific resupply, moving the concept of distributed, attritable logistics from slide deck to active procurement. The Ukraine war has supplied a working reference: the Modern War Institute essay and a sustained reader discussion of it both point to the internal drone marketplaces that have let Ukrainian front units self-procure and adapt resupply at the speed of contact. The question for the U.S. Army is whether that pattern can be institutionalized before the next peer contingency, not improvised under fire.
Standing up a cross-functional team, authorizing funds, and issuing a solicitation are the first three moves in a sequence that runs a decade. The modern U.S. military has launched cross-functional teams before and watched them absorb into the bureaucracy they were meant to reform. The Army's own analysts have now named the vulnerability in writing. The next test is whether the doctrinal, legislative, and procurement responses line up around the same model of contested sustainment, or whether each stays in its lane and the backbone stays glass.